<nz-dropdown-menu #menu="nzDropdownMenu">
  <ul nz-menu nzSelectable>
    <li nz-menu-item>1st menu item</li>
    <li nz-menu-item>2nd menu item</li>
    <li nz-menu-item>3rd menu item</li>
    <li nz-menu-item nzDanger>4th menu item</li>
  </ul>
</nz-dropdown-menu>
<a nz-dropdown [nzDropdownMenu]="menu">
  Hover me
  <span nz-icon nzType="down"></span>
</a>
